diff --git a/mozilla/content/html/content/public/nsIHTMLContent.h b/mozilla/content/html/content/public/nsIHTMLContent.h
index 59969eec9ce..81c7aa38749 100644
--- a/mozilla/content/html/content/public/nsIHTMLContent.h
+++ b/mozilla/content/html/content/public/nsIHTMLContent.h
@@ -29,7 +29,7 @@ class nsIFrame;
 class nsIStyleRule;
 class nsIMutableStyleContext;
 class nsIPresContext;
-class nsXIFConverter;
+class nsIXIFConverter;
 class nsIHTMLMappedAttributes;
 class nsIURI;
 
diff --git a/mozilla/layout/html/base/src/nsIHTMLContent.h b/mozilla/layout/html/base/src/nsIHTMLContent.h
index 59969eec9ce..81c7aa38749 100644
--- a/mozilla/layout/html/base/src/nsIHTMLContent.h
+++ b/mozilla/layout/html/base/src/nsIHTMLContent.h
@@ -29,7 +29,7 @@ class nsIFrame;
 class nsIStyleRule;
 class nsIMutableStyleContext;
 class nsIPresContext;
-class nsXIFConverter;
+class nsIXIFConverter;
 class nsIHTMLMappedAttributes;
 class nsIURI;